Aerospace - Defense

Ideal for aerospace and defence applications, the TO5 crystals can be despatched within 15 days of order as standard with shorter leadtimes of just a few days available to special order (depending on specification required and factory loading). Crystals can be produced at any frequency from 8 to 40MHz in fundamental mode and up to 260MHz in overtone modes.

The crystals are housed in the industry standard TO5 (HC35) resistance weld, hermetically sealed package and offer a well-proven design with a long history of design-ins among military and aerospace applications where durability and ability to maintain close tolerances in a hostile environment are desirable qualities. The TO5 housing is well-known for transistors and, when used to house crystals, the TO5 can has the advantage of providing a three-point crystal mounting scheme, ruggedising the crystal for shock and vibration environments.

Calibration tolerances from ±3ppm can be achieved and temperature stabilities of ±5ppm over -20 to +70 deg C are available (±3ppm over -10 to +60 deg C). Common specifications include maximum shunt capacitance (C0) of 4pF, drive level of 100 W maximum, shock of 100g/6ms, vibration of 10g/1.5mm (10 to 500Hz, 3 axis) and ageing of ±2ppm maximum for first year, ±1ppm typical per year thereafter. Various operating temperature ranges are available including 0 to 55 deg C and from -55 to +125 deg C.

Supplied in bulk packs, all crystal parameters can be customer specified without delaying the design. Thus equivalent series resistance (ESR), motional capacitance and inductance and C0:C1 ratio may all be customised to design requirements.

With annual turnover of £3.5million and a current growth rate of 12.5% per annum, Euroquartz group provides major OEMs with a global manufacturing and supply facility for all types of quartz crystals, oscillators, filters and frequency control products.

For more information, please contact: Euroquartz Ltd/Frequency Products Ltd, Blacknell Lane Industrial Estate, Crewkerne, Somerset, TA18 7HE, UK. Tel: +44 (0)1460 230000, Fax: +44 (0)1460 230001, Web: www.euroquartz.co.uk

Press enquiries to: Tim Jennings, Marshall Jennings PR Limited, Wyvols Court, Swallowfield, Reading, Berkshire, RG7 1WY, UK. Tel: +44 (0)118 988 0288, Fax: +44 (0)118 988 0388